<?php
/**
* 
*/
class Test1
{
	public static $val1=1;

	public static function t2()
	{
		self::$val1+=2;
		echo self::$val1.'';
	}
}

class Test2 extends Test1
{
	static $val1='Hello';
	static function t2()
	{
		parent::t2();
		echo self::$val1.'';
	}
}


Test1::t2();
Test2::t2();

?>